le large devil fiend 

Perception +21; greater darkvision

Languages Celestial, Draconic, Infernal; telepathy 100 feet

Skills Arcana +18, Deception +19, Intimidation +21, Religion +17, Stealth +20

Str +5 Dex +5 Con +4 Int +3 Wis +4 Cha +4

AC  28; Fort +17, Ref +18, Will +17; +1 status to all saves vs. magic

HP 135; Immunities fire; Weaknesses good 10; Resistances physical 10 (except silver), poison 10

Speed 35 feet, fly 30 feet

Melee [>] jaws +21 (evil, magical), Damage 2d10+11 piercing plus 1d6 evil

Melee [>] claw +21 (agile, evil, magical, reach 10 feet), Damage 2d6+11 slashing plus 1d6 evil

Melee [>] stinger +21 (evil, magical, reach 15 feet), Damage 1d10+11 piercing plus 1d6 evil and osyluth venom

Ranged [>] bone shard +21 (evil, magical, range increment 30 feet), Damage 2d6+8 piercing

Divine Innate Spells DC 25; 5th dimension door, phantom pain; 4th dimension door (at will), dimensional anchor (×2), discern lies, zone of truth; 2nd invisibility (at will, self only)

Rituals DC 25; infernal pact

Osyluth Venom (poison) Saving Throw DC 25 Fortitude; Maximum Duration 6 rounds; Stage 1 2d6 poison damage, enfeebled 1 (1 round); Stage 2 3d6 poison damage and enfeebled 1 (1 round); Stage 3 3d6 poison damage and enfeebled 2 (1 round); Effect Once a creature reaches stage 3, it takes a –4 status penalty to Will saves against attempts to Coerce it for 1 hour (this is a mental effect).

Quick Invisibility The osyluth can cast innate invisibility using only 1 action.

Sadistic Strike An osyluth deals an extra 2d6 damage whenever they Strike an enfeebled, frightened, or prone creature.

Stygian Inquisitor [>] (linguistic, mental) The osyluth telepathically questions a creature affected by zone of truth. After 1 round, if the creature intentionally refuses to answer the question, it takes 2d6 mental damage.

Tail Sweep [>] The osyluth sweeps their tail in a 15-foot cone. Each creature in the cone must succeed at a DC 26 Reflex save or be knocked prone.

Bestiary 2, page 74. Originally in AoA3.